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Add Luminance to Color

Browse source 
To sort an image's colors from darkest to lightest, you can then do:

```handlebars
{{ {{ $colorsByLuminance := sort $image.Colors "Luminance" }}
```

This uses the formula defined here: https://www.w3.org/TR/WCAG21/#dfn-relative-luminance

Fixes #10450
This commit is contained in:
Bjørn Erik Pedersen 2024-04-15 10:09:25 +02:00
parent 74e9129568
commit e197c7b29d
12 changed files with 204 additions and 39 deletions
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29
resources/image_test.go
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@ -85,9 +85,16 @@ func TestImageTransformBasic(t *testing.T) {
assertWidthHeight(c, img, w, h)
}
colors, err := image.Colors()
gotColors, err := image.Colors()
c.Assert(err, qt.IsNil)
c.Assert(colors, qt.DeepEquals, []string{"#2d2f33", "#a49e93", "#d39e59", "#a76936", "#737a84", "#7c838b"})
expectedColors := images.HexStringsToColors("#2d2f33", "#a49e93", "#d39e59", "#a76936", "#737a84", "#7c838b")
c.Assert(len(gotColors), qt.Equals, len(expectedColors))
for i := range gotColors {
c1, c2 := gotColors[i], expectedColors[i]
c.Assert(c1.ColorHex(), qt.Equals, c2.ColorHex())
c.Assert(c1.ColorGo(), qt.DeepEquals, c2.ColorGo())
c.Assert(c1.Luminance(), qt.Equals, c2.Luminance())
}
c.Assert(image.RelPermalink(), qt.Equals, "/a/sunset.jpg")
c.Assert(image.ResourceType(), qt.Equals, "image")
@ -445,6 +452,24 @@ func TestImageExif(t *testing.T) {
getAndCheckExif(c, image)
}
func TestImageColorsLuminance(t *testing.T) {
c := qt.New(t)
_, image := fetchSunset(c)
c.Assert(image, qt.Not(qt.IsNil))
colors, err := image.Colors()
c.Assert(err, qt.IsNil)
c.Assert(len(colors), qt.Equals, 6)
var prevLuminance float64
for i, color := range colors {
luminance := color.Luminance()
c.Assert(err, qt.IsNil)
c.Assert(luminance > 0, qt.IsTrue)
c.Assert(luminance, qt.Not(qt.Equals), prevLuminance, qt.Commentf("i=%d", i))
prevLuminance = luminance
}
}
func BenchmarkImageExif(b *testing.B) {
getImages := func(c *qt.C, b *testing.B, fs afero.Fs) []images.ImageResource {
spec := newTestResourceSpec(specDescriptor{fs: fs, c: c})